Was your original issue dealing with an already typed password? The stick would emulate a USB keyboard using something like a tiny and wouldn't be left attached

Was your original issue dealing with an already typed password? The stick would emulate a USB keyboard using something like a tiny and wouldn't be left attached. It would perform edits to the password and try to determine which charecters were special, the apply a simplified dictionary attack to the contiguous groupings of characters of the same class. The goal would be to reduce the space of the attempted guess. I don't see how it would be a practical attack though.